CVE-2026-2659Public exploit

Local interpreter crash via empty target-stack pop

Published Feb 18, 2026 · Updated Feb 18, 2026

Out-of-bounds read in the Squirrel 3.0 through 3.2 compiler allows local users to crash the interpreter with crafted source code. SQFuncState::PopTarget in src/squirrel/squirrel/sqfuncstate.cpp reads the last _target_stack element after compiler expression tracking has emptied the stack, producing an index-minus-one heap underflow. The user must be able to run the interpreter on a crafted script; the demonstrated result is an eight-byte read followed by process termination, with no supported integrity or confidentiality impact.

CVSS severity7.8
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Squirrel 3.0 through 3.2 compiler allows local users to crash the interpreter with crafted source code. SQFuncState::PopTarget in src/squirrel/squirrel/sqfuncstate.cpp reads the last _target_stack element after compiler expression tracking has emptied the stack, producing an index-minus-one heap underflow. The user must be able to run the interpreter on a crafted script; the demonstrated result is an eight-byte read followed by process termination, with no supported integrity or confidentiality impact.

The record

CVE
CVE-2026-2659
Published
Feb 18, 2026
Updated
Feb 18, 2026
Vendor
Squirrel
Product
Squirrel
Classifications
CWE-125, CWE-119, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.0
  2. Affected versionversion=3.1
  3. Affected versionversion=3.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Squirrel · Squirrelversion=3.0; version=3.1; version=3.2

Published CVSS scores

3.3VulDB CNACVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
1.7VulDB CNAAV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.3VulDB CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
1.9VulDB CNACVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Endpoint Denial of Service Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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